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This question is a bit vague, as retrograde could describe a planet's orbit about its parent star, or its spin about its axis.
Retrograde is a term meaning in opposite of the norm. Most objects in our Solar System orbit the Sun in a counter-clockwise direction from the perspective of an observer above the Sun's north pole, and also spin in a counter-clockwise direction.
There are no known planets in retrograde orbit about their parent star, but there are a few objects in our Solar System which are in retrograde orbit (Halley's Comet among them). The largest known object with a retrograde orbit is Triton, a moon of Neptune; Triton orbits Neptune in a retrograde fashion. If Earth's moon had a retrograde orbit (instead of the prograde, or regular orbit, it actually has) the way Triton has about Neptune, the observable effects from the perspective of someone on earth would be the moon rising in the West and setting in the East (instead of rising in the East and setting in the West as it presently appears to), tides would be different, and the moon would likely not have the same side facing earth (so there would be no 'dark side of the moon' constantly hidden from earth; we would be able to see the moon spin) because the moon would likely not become tidally locked with the earth as it has become with its actual prograde orbit about the earth.
Two planets have a retrograde spin: Venus and Uranus. Uranus is actually, essentially, tipped on its side compared with the other planets, with its poles nearly pointing toward the sun and its equator (the line of latitude of the planet midway between its axes) spinning nearly perpendicularly to the solar plane. Venus is more closely aligned with the solar plane, but it spins in a clockwise fashion compared with the other planets. If we were on Venus, the effect of its retrograde spin (compared with being on Earth and its prograde spin) would be the sun would appear to rise in the West and set in the East instead of (as we observe on earth) rising in the East and setting in the West.
What else can I help you with?
The apparent westward movement of a planet is known as?
The apparent westward movement of a planet is known as retrograde motion. This phenomenon occurs when a superior planet passes Earth in its orbit, making it appear to move backward in the sky relative to the stars.
What is a retrogade planet?
A planet isn't retrograde - retrograde means the direction a planet moves in relation to how we see it here on Earth or other perspectives. Planets sometimes appear to move backward due to Earth moving as well.
Which two planets have Retrograde motion?
Venus and Uranus have retrograde rotation.There are other meanings of retrograde motion, but retrograde rotation fits the question best.
How can you explain retrograde motion today?
Retrograde motion is an optical illusion where a planet appears to move backwards in its orbit when viewed from Earth. This occurs due to the difference in orbital speeds between Earth and the observed planet. Modern understanding attributes retrograde motion to the relative motion and positions of the Earth and the observed planet as they orbit the Sun.
When a planet is undergoing retrograde motion the right ascension?
When a planet is undergoing retrograde motion, its right ascension will appear to decrease over time. This occurs because, from our perspective on Earth, the planet seems to move backward against the backdrop of stars. This apparent motion is a result of the relative positions and motions of Earth and the other planet in their respective orbits. Consequently, the right ascension changes as the planet moves in the opposite direction to its usual path.
The apparent westward movement of a planet is known as?
The apparent westward movement of a planet is known as retrograde motion. This phenomenon occurs when a superior planet passes Earth in its orbit, making it appear to move backward in the sky relative to the stars.
When mars is in retrograde motion will it appear brighter or dimmer?
When Mars is in retrograde motion, it does not affect its brightness. Mars will continue to appear at its usual brightness in the night sky regardless of its retrograde motion. Retrograde motion refers to how the planet appears to move in the sky, not its actual brightness.
How did the Ptolemaic model of the universal explain retrograde motion?
If observed from one night to the next, a planet appears to move from West to East against the background stars most of the time. Occasionally, however, the planet's motion will appear to reverse direction, and the planet will, for a short time, move from East to West against the background constellations. This reversal is known as retrograde motion.
What is it called when a planet appears to move bacwards in is orbit?
"retrograde motion"
When a planet appears to stop in its orbit and move backwards this motion is called?
This motion is called retrograde motion. It occurs when a planet's motion in its orbit appears to reverse due to differences in orbital speeds and distances from Earth.
What do the planets do to incur retrograde motion?
The planets don't have to "do anything" to "go into" retrograde motion. The retrograde motion, the "moving backward" that planets do as we watch them cross the night sky over the weeks, is due to the nature of the orbit of a planet and to our view of that orbit from earth.
What is a retrogade planet?
A planet isn't retrograde - retrograde means the direction a planet moves in relation to how we see it here on Earth or other perspectives. Planets sometimes appear to move backward due to Earth moving as well.
Which two planets have Retrograde motion?
Venus and Uranus have retrograde rotation.There are other meanings of retrograde motion, but retrograde rotation fits the question best.
How can you explain retrograde motion today?
Retrograde motion is an optical illusion where a planet appears to move backwards in its orbit when viewed from Earth. This occurs due to the difference in orbital speeds between Earth and the observed planet. Modern understanding attributes retrograde motion to the relative motion and positions of the Earth and the observed planet as they orbit the Sun.
When a planet is undergoing retrograde motion the right ascension?
When a planet is undergoing retrograde motion, its right ascension will appear to decrease over time. This occurs because, from our perspective on Earth, the planet seems to move backward against the backdrop of stars. This apparent motion is a result of the relative positions and motions of Earth and the other planet in their respective orbits. Consequently, the right ascension changes as the planet moves in the opposite direction to its usual path.
How can planet retrograde motion be explained by the Earth-center hypothesis By the Sun-center hypothesis?
In the Geocentric Hypothesis (Earth-centered), retrograde motion can only be explained by describing the motion of planets as complex, curlicue paths. In the Heliocentric Hypothesis (Sun-centered), retrograde motion is described as changes in relative motion as the Earth overtakes a slower-moving planet in an outer orbit, or is overtaken by a faster-moving planet in an inner orbit. In the Heliocentric Hypothesis, all planets move in more-or-less circular orbits at more-or-less constant speeds, but planets closer to the Sun move faster. Thus, the Earth can overtake and pass each of the outer planets, making them appear to move "backward" (retrograde) for a time.
What is a planet's backward motion in the sky called?
A planet's backward motion in the sky is called retrograde motion. This occurs when a planet appears to move in the opposite direction in the night sky compared to its usual eastward movement.
